// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/strings/string16.h"

#if defined(WCHAR_T_IS_UTF16)

#error This file should not be used on 2-byte wchar_t systems
// If this winds up being needed on 2-byte wchar_t systems, either the
// definitions below can be used, or the host system's wide character
// functions like wmemcmp can be wrapped.

#elif defined(WCHAR_T_IS_UTF32)

#include <ostream>

#include "base/strings/utf_string_conversions.h"

namespace base {

size_t c16len(const char16* s)
{
    const char16* s_orig = s;
    while (*s) {
        ++s;
    }
    return s - s_orig;
}

int c16memcmp(const char16* s1, const char16* s2, size_t n)
{
    // We cannot call memcmp because that changes the semantics.
    while (n-- > 0) {
        if (*s1 != *s2) {
            // We cannot use (*s1 - *s2) because char16 is unsigned.
            return ((*s1 < *s2) ? -1 : 1);
        }
        ++s1;
        ++s2;
    }
    return 0;
}

const char16* c16memchr(const char16* s, char16 c, size_t n)
{
    while (n-- > 0) {
        if (*s == c) {
            return s;
        }
        ++s;
    }
    return 0;
}

char16* c16memmove(char16* s1, const char16* s2, size_t n)
{
    return static_cast<char16*>(memmove(s1, s2, n * sizeof(char16)));
}

char16* c16memcpy(char16* s1, const char16* s2, size_t n)
{
    return static_cast<char16*>(memcpy(s1, s2, n * sizeof(char16)));
}

char16* c16memset(char16* s, char16 c, size_t n)
{
    char16* s_orig = s;
    while (n-- > 0) {
        *s = c;
        ++s;
    }
    return s_orig;
}

std::ostream& operator<<(std::ostream& out, const string16& str)
{
    return out << UTF16ToUTF8(str);
}

void PrintTo(const string16& str, std::ostream* out)
{
    *out << str;
}

} // namespace base

template class std::basic_string<base::char16, base::string16_char_traits>;

#endif // WCHAR_T_IS_UTF32
